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# gravitational waves

## Latest Articles

### An Enormous Gravity ‘Hum’ Moves Through the Universe

Astronomers have found a background din of exceptionally long-wavelength gravitational waves pervading the cosmos.

### At Long Last, Mathematical Proof That Black Holes Are Stable

The solutions to Einstein’s equations that describe a spinning black hole won’t blow up, even when poked or prodded.

### Mass and Angular Momentum, Left Ambiguous by Einstein, Get Defined

Surprising as it may sound, 107 years after the introduction of general relativity, the meanings of basic concepts are still being worked out.

### Massive Black Holes Shown to Act Like Quantum Particles

Physicists are using quantum math to understand what happens when black holes collide. In a surprise, they’ve shown that a single particle can describe a collision’s entire gravitational wave.

### A New Tool for Finding Dark Matter Digs Up Nothing

Physicists are devising clever new ways to exploit the extreme sensitivity of gravitational wave detectors like LIGO. But so far, they’ve seen no signs of exotica.

### Gravitational Waves Should Permanently Distort Space-Time

The “gravitational memory effect” predicts that a passing gravitational wave should forever alter the structure of space-time. Physicists have linked the phenomenon to fundamental cosmic symmetries and a potential solution to the black hole information paradox.

### New Black Hole Math Closes Cosmic Blind Spot

A mathematical shortcut for analyzing black hole collisions works even in cases where it shouldn’t. As astronomers use it to search for new classes of hidden black holes, others wonder: Why?

### Growing Inventory of Black Holes Offers a Radical Probe of the Cosmos

One black hole is nice, but astrophysicists can do a lot more science with 50 of them.

### Debate Erupts Over How ‘Forbidden’ Black Holes Grow

Once missing in action, middleweight black holes have finally been detected. Now researchers are trying to figure out how they grow from small ones.